There are six different classes in Transformers: Forged to Fight. These represent the origin of each bot (how they either obtained or use their abilities).
Class vs Class Bonus and Enemy Class Breakdown:
You can view the enemy class breakdown within a mission by selecting the reticle icon on the bottom right-hand corner of the screen above the quit mission icon.
On the pop-up that appears, you can view how many enemies of each class type are on the mission, as well as the determine the enemy class type of the boss by the skull icon.